Still no sign of missing plane

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The search for a light aircraft and its pilot, missing for more than four days, has failed to find any sign of them.

Auckland man Daroish Kraidy took off from Ardmore south of Auckland on Tuesday in his aerobatic biplane and was last seen heading northeast. It hasn't been seen since.

The Rescue Co-ordination Centre (RCCNZ) said the search was continuing as they reviewed the information they had collected.

"We are going through the review process of all the data and information received on the search process and making sure nothing has been missed. That just ensures we get fresh eyes on the search and what has been done," said a RCCNZ spokesperson.

The process identified Cuvier Island, near Great Barrier Island, as not properly covered, but a subsequent search by the Westpac Rescue helicopter found nothings.

"(The search) is ongoing. We are assessing whether there are any other steps we can take. We are still looking at the information we have and looking at whether we have any other options for searching," the spokesperson said.

Last week search teams covered five areas comprising Wainuiototo Bay, the eastern side of the Coromandel Peninsula, a bush area to south of Miranda on the eastern side of the Firth of Thames, the Karangahake Gorge between Paeroa and Waihi, and the northern end of the Firth of Thames.

A decision on whether to formally suspend the search will be made next week based on whether there are areas that require continued exploration.